It IS kind of confusing because fairly offen I'll see articles referring to a 3-4 OLB as a DE and a 3-4/ 3 tech, as an example, as a DE.
I think of all three down lineman in a 3-4 as defensive tackles or nose tackles.
In the last five or six years I see them referring to a 3-4 OLB as an EDGE more often as a way to differentiate, (I would guess).
You have every right to be confused. No one plays a pure scheme with their defense on even the majority of their snaps. DC's are constantly shifting guys around to gain an advantage. The line is completely blurred because AD is thought of as a DT but look how many times he's lined up outside? It's all about creating mismatches and confusion. The more versatile your players are the more that can be done with them.
There are many times Floyd has his hand in the dirt but doesn't commit to a full rush, and instead is playing like a true LB looking for the screen, swing pass, or rollout. Brockers himself was moved inside and outside, but he was always coming and the OL always knew it. People need to think of this defense more as a 4-3 one gap scheme being played with a lot of OLBs instead of DEs because that is what the hybrid scheme is all about. Staley was also big on playing a nickel and sometimes a dime because he had good depth at safety. Morris will have a lot of options with his secondary and I can see him using Fuller and Rapp who are really SS types as hybrid LBs.
I really can see the trend away from ILBs to that hybrid type, i.e. SS traits. Guys like Bobby Wagner really set the tone for that type of player. He's considered an ILB but at 6 ft tall weighing in around 240, but running in the 4.4 range he could also be a SS but with the Hawks he's their middle LB (MIKE). Teams are evolving towards a pass-first offensive mentality, which is highlighted by what teams now value in their QBs.
Back when Reeder was a rookie I mentioned him as a darkhorse contender for that MIKE position. Why? Because at 6'1", 235 lbs, running a 4.62 (faster than Fuller) he had the traits of another Wagner type of MIKE. He's still developing and given time he has considerable upsides in this scheme. Snead has made a real effort to increase team speed at all the skill positions. Jones is a clear departure from that and is due to Morris advocating for his pick. Jones would be a fit for MIKE in the hybrid scheme run by Wade Phillips which is a standard version of the 3-4 hybrid. In that version you want an early down thumper who helps keep the offense behind the chains then gets pulled on passing downs.
Staley's scheme is skewed towards a heavy emphasis on pass defense. His feelings looked to be to contain the run while you defend the pass. Let me be clear, I have no problem with Morris running a more conventional 3-4 hybrid scheme because when played correctly it's extremely effective. Baltimore runs a conventional hybrid scheme and their defense was right behind the Rams in the rankings. It's also, more effective at stopping as opposed to containing the run game.
Yes... Floyd is an amazing fit in this defense. 
